Sheet-metal drain-pipe.



W. N. KLOTZ.

SHEET METAL DRAIN PIPE.

APPLICATION FILED SEPT. 4, 1908.

Patented 0ct.7,1913.

INVENTOR V/ITNESSES ATTORNEY UNTTE STAT ATE T FTQlil.

WILLIAM'. N. KLOTZ, OF CANTN, OHIO, ASSIGNOR TO THE CANTON CULVERT COMEANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

SIEETMETAL DRAIN-PIPE.

Specification of Letters Patent,

Patented 9ct. 7, i913,

Application filed September 4, 1908. Serial No. 451,655.

To all whom @'25 may concern Be it known that l, lVILLrAM N. KLoTz, a citizen of the United Sta-tes, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Improvement in Sheet-Metal Drain-Pipes, of which the following is a specification.

The invention relates to drain pipes made of sheet metal, preferably galvanized sheet iron or steel, which same are usually made with annular oorrugations to increase the strength of the sheet metal. Such pipes are frequently made of semi-circular sections which are adapted to be nested together for shipment, and to be assembled to form a pipe at the place of use by joining together the side and end edges of the respective sections; and the object of the present invention is to provide a tight and secure joint between the side edges of the sections, whereby the sections can be assembled to form a pipe without the use of bolts or other auxiliary connecting or securing devices. This object is attained by forming the side edges of the sections straight or flat and by folding one opposing edge twice upon itself to form a longitudinal groove in which the other edge is adapted to be entered and clamped, which slip joint holds the edges securely together while the pipe is being formed, and when the pipe is covered the edges thus joined cannot be separated.

The invent-ion, thus set forth in general terms, is illustrated in the accompanying drawings, forming part hereof, in which- Figure l is a perspective view of the improved pipe showing one section slightly separated from the others; Fig. 2, a longitudinal-vertical section of the pipe; Fig. 3, a cross section showing a modified arrangement of the joints; and Fig. 4l, a cross section showing a modified form of the pipe.

Similar numerals refer to similar parts throughout the drawings.

The upper and lower sections l and la, are shaped in semi-circular form by rolling or stamping, and are preferably provided with the annular corrugations 2. The edge portions 3 and Se of each section are each formed longitudinally flat, and the flat portion of one opposing edge, preferably of the lower section, is made wider than the other edge, and is folded twice upon itself to form the longitudinal groove 4E which is preferably tapered in its depth, in which groove the ilat or tongue edge of the other section is adapted to be entered and wedged. The free edges 5 of the grooves are preferably turned slightly inward, so that when the tongue edges are entered therein, they will be clamped by the spring of the inturned edges, over the shoulders 5a formed at the base of the opposing edges.

@ne corrugation of the end edge 6 of one section is preferably lapped over a corresponding corrugation on the end edge 6a of the longitudinally adjoining section, and to permit such overlapping, the corresponding ends of the edge portions are cut away as at 2' and 7a. Tt is not essential that the portion 7 of the plain or tongue edges shall be cut away for the reason that such portions of these edges can overlap each other in the grooves of the opposing section, but it is preferred to cut away the overlapping portions of these edges so that a single thickness only thereof will be entered in the opposing grooves at the end joints.

In the modified arrangement of the joints shown in F ig. 3, eachV opposing section is provided with a tongue on one side edge and a groove on the other, which arrangement may loe preferred for the reason that all the sections are thus formed substantially alike and can be interchanged; and in the modi-ed form of pipe shown in Fig. 4, the upper section only is corrugated and includes a greater' portion of the circumference than the lower section, which latter is formed longitudinally flat.

lrt is evident that the sections of a pipe made as herein set fort-h can be readily assembled by merely entering the side edge tongues of one section into the side edge grooves of the opposing section with the end edo'es overlapping, and that the tongue will be suiliciently wedged or clamped in the groove to secure the section in proper position while the pipe is being formed; and that after the pipe is formed and covered, the weight of the cover prevents the tongues from being wit idrawn from the grooves, thereby making a permanently tight joint, which is thus accomplished without the use of bolts or other separate fastening means. lt is evident that it is not essential to flatten the side edges before shaping the one to form a groove for the other tongueugr... i

edge, but it is preferred to do so for the tongue-edge is thereby more readily entei-ed into the groove edge, and makes a better iit therein.

wWhat l claim as my invent-ion, and desire to secure by Letters Patent, is-

l. A sheet-metal pipe including a series of sections having one of each opposing Side elges twice folded to form a wedge groove in which the other one is entered.

2. A transversely-curved and annularlycorrugated pipe section having one side edge flattened and twice folded to form a wedge groove and the other fiattened to form a tongue.

3. A transversely-curved annularly-corrugated pipe section having one side edge iiattened and shaped to form a wedge groove and the other flattened to form a tongue.

Ll. A transversely-curved annularly-corrugated sheet-metal pipe section having its 7. A transversely-curved annularly-cor rugated sheet-metal pipe section having its side edges flattened and one side edge shaped to forni a wedge groove.

S. A transversely-curved sheet-metal pipe section having one side edge twice folded to form a wedge groove.

WILLIAM N. KLOTZ. l/Vitnesses DAVID B. SMITH, HARRY FREASE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

